Sandi Input Receiver Venus
7 RXD0 Input Received input of the as ynchronous UART port. Used to input binary command to the GPS receiver. 3.3V LVTTL Add 4.7K series resistor if putting Venus828F to sleep by shutting off main power supply.
This page describes the design of a software defined radio receiver station for the 5.6-5.9 GHz band, originally created for tracking the spacecraft on its interplanetary journey to Venus.Event logbook is available on the.UNITEC-1 is the first interplanetary spacecraft built by university students. It will be transmitting telemetry using OOSK at 1 bps in the 5.7 GHz amateur radio band using a 10W RF into a pair of patch antennas. UNITEC-1 operators need the help of the global amateur radio community for tracking their spacecraft during its journey to Venus.
Antenna pointing and Doppler shift measurements will be used for estimating the interplanetary trajectory of the craft. Contents.System OverviewLink Budget SummaryThe detailed link budget calculations are available here:.ParameterValueFrequency5840 MHzTX power4.8 W / 6.8 dBW / 36.8 dBmTX Ant gain5 dBiEIRP11.8 dBWDistance (km)20.0.000.00015.000.00020.000.000Distance (AU)0.000360.100916Free Space Loss194 dB214 dB234 dB251 dB254 dBAtm. The USRP equipped with a WBX transceiver board and the TVRX receiver.The receiver is a software defined radio and has two parts:. The hardware part — Converts the 400-700 MHz IF to and sends it to a computer. The software part — Takes the baseband data from the hardware and performs filtering and demodulation in softwareReceiver HardwareThe receiver hardware is based on the Universal Software Radio Peripheral (USRP) equipped with a WBX transceiver board.
On the receiver side, it is a direct conversion software defined radio architecture where the RF is converted to using a quadrature demodulator , digitized using 12 bit A/D converters and down-sampled using an. The resulting digital data is 16 bit signed I/Q that is sent to the host computer via USB2 interface.The USRP ArchitectureThe USRP can host 2 receivers and 2 transmitters that can work at the same time sharing a total bandwidth of 8 MHz. Note that the ADCs are clocked at 64 MHz but the effective bandwidth is limited by the USB 2.0 interface to the host computer.When we take all the protocol and other overhead away, USB 2.0 gives us 32 Mbytes/sec data rate. The USRP1 uses complex 16 bit signed integers (4 bytes/sample) and therefore we get 8 Msps. Since we use complex processing this gives a maximum effective total bandwidth of 8 MHz.The WBX ReceiverThe WBX is a full duplex transceiver board covering 50 MHz – 2.2 GHz. For this project we are only concerned about the receiver.WBX receiver specificationsRev2Frequency50 MHz - 2.2 GHzNoise Figure5-6 dbSensitivy (CW)better than -130 dBmIIP240-55 dBmIIP35-10 dBmAGC Range70 dBAntennaTX/RX and RX2A block diagram of the WBX receiver is shown below.
The detailed schematics are available from. Two GaAs MMIC T/R switches are used to configure the connection between antenna connectors and receiver/transmitter. We will use the RX2 input so that we only have one switch in the loop (estimated 0.5 dB improvement). GaAs MMIC low noise amplifier gives 22dB gain at 0.9 dB noise figure. is a broadband 6-bit GaAs IC digital attenuator programmable in 0.5 dB steps.
GaAs MMIC driver amplifier gives additional 13 dB gain at 2.2 dB noise figure. 50 MHz to 2 GHz quadrature I/Q demodulator converts the RF to complex signal. wideband synthesizer provides local oscillator signal for the I/Q demodulator. low distortion differential ADC driver brings the signal up to level suitable for the ADC. The ADC full scale is 2 Vpp / 50Ω differential but there is also a 20dB reducing the required input level to 0.2 Vpp.The USRP FPGAThe FPGA contains the digital down-converter that the data to fit within the 8 MHz we can transfer over the USB. Actually, the decimation is variable between 8 and 256 allowing for bandwidth as low as 250 kHz (64MHz/256). The decimation factor is distributed between a four stage decimating and a 31 tap halfband filter that decimates by 2.USRP receiver specificationsRev1.7?Sample rate64 Ms/sResolution12 bits85 dBMax Bandwidth16 MHzHost InterfaceUSB 2.0Note that the FPGA design also includes a mixer and an oscillator which allows the use of intermediate frequency input instead of baseband.
This is very useful when we use an RF front end like the TVRX which outputs a 6 MHz wide spectrum centered around 5.75 MHz. Other RF boards output baseband signal centered around 0 Hz; however, the NCO is also useful for these board. The local oscillators on the RF boards have a limited resolution that does not always (read rarely) allows tuning to the exact frequency requested by the user. Using the NCO we can compensate for this difference. Fortunately, this is done automatically by the USRP and/or the GNU Radio driver and we don't have to worry about it.For more technical details about the USRP I can recommend by Eric Blossom and aka. USRP FAQ.Receiver SoftwareTo be written.The receiver software is implemented using the GNU Radio framework.Test Campaigns 2010.03.23First time we powered up the LNC.We were hoping to receive on 5760.930 MHz but in the OZ7SAT building we could only receive it while an airplane was passing by (reflection).We will try again later on the roof, which will hopefully give clearer line of sight to OZ7IGY.We could detect signal from an 5.8 GHz signal generator, but the generator was not suitable for quantitative measurements.2010.04.13New session where we attempted reception of OZ7IGY.
Tests were successful even though we only received a reflection and not the direct signal from OZ7IGY. Details are in.2010.04.24European EME Contest on 5.8 GHz. We missed this opportunity because the antenna was not finished.2010.05.18Tested small 90cm dish with home made helical feed using OZ7IGY, see.2010.05.21Since we couldn't receive UNITEC-1 using the 90cm dish we decided to move the LNC over to the 7 meter dish. Once done we tested the receiver system on 5.7 GHz using OZ7IGY. This was actually the first time we tested the complete receiver chain as depicted in the diagram.OZ7IGY beacon signal on 5.7 GHz received at OZ7SAT using the 7 meter dish, KU LNC 5659 CPRO, USRP, WBX and GNU Radio software defined radio receiver:Video is available.2010.05.22We let the receiver listen to OZ7IGY since last night. Frequency drift was no more than 1 kHz.
Sandi Input Receiver Venus Tv
Ps3 mods download fallout 3. LNC currently mounted outside without any thermal protection.References. ↑ Louis J.